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https://issues.apache.org/jira/browse/LUCENE-8229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16428112#comment-16428112
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Alan Woodward commented on LUCENE-8229:
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OK, the latest iteration moves the notion of a match containing no hits up to
the Matches object, and has a default implementation on Weight. This makes the
patch much smaller - thanks for the suggestion [~dsmiley]!
I think I'd like to keep the name Matches - we might at some point in the
future want to add the ability to return matches from DocValues fields, for
example, so we wouldn't necessarily be returning positions.
Re payloads, that's a convincing use-case. I have some concerns as to how to
implement them over composite matches, such as Phrases or Spans, which aren't
dealt with yet, so let's do that in a follow-up issue.
> Add a method to Weight to retrieve matches for a single document
> ----------------------------------------------------------------
>
> Key: LUCENE-8229
> URL: https://issues.apache.org/jira/browse/LUCENE-8229
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Attachments: LUCENE-8229.patch
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> The ability to find out exactly what a query has matched on is a fairly
> frequent feature request, and would also make highlighters much easier to
> implement. There have been a few attempts at doing this, including adding
> positions to Scorers, or re-writing queries as Spans, but these all either
> compromise general performance or involve up-front knowledge of all queries.
> Instead, I propose adding a method to Weight that exposes an iterator over
> matches in a particular document and field. It should be used in a similar
> manner to explain() - ie, just for TopDocs, not as part of the scoring loop,
> which relieves some of the pressure on performance.
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